是什么导致MoveFileTransactedW挂起？

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问题描述

我们在从.Net 4 C＃应用程序保存文件时使用MoveFileTransactedW（也就是说，我们写入临时文件，然后将文件移动到其中实际位置）。

We are using MoveFileTransactedW when saving files from our .Net 4 C# application (that is, we write to a temporary file and then move the file to its actual location).

在两台独立的计算机（都是Windows 7）上，我们很少发生似乎对MoveFileTransactedW的调用永远不会返回的情况（至少根据我们查看的小型数据库）。

On two separate computers (both Windows 7) we have had a rare occurrence where it seems the call to MoveFileTransactedW never returns (at least according to the minidumps we looked at).

执行移动的代码看起来像这样（我删除了一些代码来处理不支持事务的情况以及其他一些错误处理）：

The code that executes the move, looks like this (i removed some code that handles the case where transactions arent supported as well as some other error handling):

   var transaction = CreateTransaction( IntPtr.Zero, IntPtr.Zero, 0, 0, 0, 0, IntPtr.Zero );

   try {
     bool result = MoveFileTransactedW( src, dest, IntPtr.Zero, IntPtr.Zero, MoveFileFlags.MOVEFILE_REPLACE_EXISTING | MoveFileFlags.MOVEFILE_WRITE_THROUGH, transaction );
     result &= CommitTransaction( transaction );
     if ( !result ) {
      File.Replace( src, dest, null );
     }
    }
    finally {
     CloseHandle( transaction );
    }

并且DLL导入：

  [DllImport( "KtmW32.dll" )]
   private static extern bool CommitTransaction( IntPtr transaction );

  [DllImport( "Kernel32.dll" )]
   private static extern bool CloseHandle( IntPtr handle );

  [DllImport( "KtmW32.dll" )]
   private static extern IntPtr CreateTransaction( IntPtr lpEventAttributes, IntPtr UOW, UInt32 createOptions, UInt32 isolationLevel, UInt32 isolationFlags, UInt32 timeOut, IntPtr description );

  [return: MarshalAs( UnmanagedType.Bool )]
   [DllImport( "kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true )]
   private static extern bool MoveFileTransactedW( [In] string lpExistingFileName, [In] string lpNewFileName, [In] IntPtr lpProgressRoutine, [In] IntPtr lpData, [In] MoveFileFlags dwFlags, [In] IntPtr hTransaction );

任何想法可能导致什么？我尝试过各种场景，涉及在同一个文件上打开的其他事务，锁定文件等，但MoveFileTransactedW总是返回。

Any ideas what could cause this? I have tried various scenarios involving other transactions open on the same file, locking the files etc, but MoveFileTransactedW always returns.

stacktrace的最后一部分是：

The last part of the stacktrace is this:

> （）

> ntdll.dll!_KiFastSystemCallRet@0()

（） + 0xc字节

ntdll.dll!_NtSetInformationFile@20() + 0xc bytes

（） + 0x18c字节

kernel32.dll!_MoveFileWithProgressTransactedW@24() + 0x18c bytes

（） + 0x47字节

kernel32.dll!_MoveFileTransactedW@24() + 0x47 bytes

[管理到原生过渡]

[Managed to Native Transition]

也许我应该避免使用MOVEFILE_WRITE_THROUGH标志？根据没有必要，但我发现描述有点不清楚，因此无论如何我添加了它：）

Perhaps i should avoid using the MOVEFILE_WRITE_THROUGH flag? According to http://msdn.microsoft.com/en-us/library/aa365241(v=vs.85).aspx it is not necessary, but i found the description a bit unclear, and therefore i added it anyway :)

the

是什么导致MoveFileTransactedW挂起？

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